Abstract

The gas-phase clustering reaction, OCS+(OCS)n-1+OCS=OCS+(OCS)n, was investigated using a pulsed-electron beam high-pressure mass spectrometer. The bond energies of OCS+(OCS) and OCS+(OCS)2 were determined to be 23.9 and 7.8 kcal/mol, respectively. The sudden drop of the bond energies OCS+(OCS)→OCS+(OCS)2 indicates the covalent bond formation in the dimer cation (OCS)2+ and the interaction in the trimer cluster ion (OCS)2+ … OCS is mainly electrostatic.

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